Steiner, Kim. 2020. The Past Is Prologue: Understanding the Current State of Tree Improvement in the United States. In: Nelson, C. Dana; Koch, Jennifer L.; Sniezko, Richard A., eds. Proceedings of the Sixth International Workshop on the Genetics of Host-Parasite Interactions in Forestry Tree Resistance to Insects and Diseases: Putting Promise into Practice. Gen. Tech. Rep. SRS 252. Asheville, NC: U.S. Department of Agriculture Forest Service, Southern Research Station.